Middle French is the language that falls between Old French and Modern French. The main distinctions between Middle French, Old French and Modern French include the loss of the nominative/oblique case system, and the use of the 'y' where Modern French would use an 'i'.

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Terms must be attestable per Wiktionary:Criteria for inclusion between 1340 and 1611. From 1612 onward, this is considered Modern French. The choice of these two specific years is to align the English Wiktionary with the English Wikipedia, the French Wikipedia and the French Wiktionary. Other than this, it is somewhat arbitrary.

The most important factor in deciding which spellings to include is WT:CFI#Attestation, specifically "For terms in extinct languages: usage in at least one contemporaneous source." That is to say, any attested orthography may be included.

Where possible, the original orthography should be verified, for example from a screen shot of the original source (example Michel de Montaigne, Essais). Where multiple copies of a text using different orthography are available, all attestable spellings of a word are permitted. For example, iecter and ietter are both found in printed sources between 1360 and 1610, so both are allowable.

'I' and 'j' are both used for the modern consonant 'j' in Middle French, so spellings with both are included when attested. It is advisable to use {{alternative form of||lang=frm}} wherever practical to reduce duplication. For example jecter has the definition {{alternative form of|iecter|lang=frm}}.

The standard Latin s (s) is preferred to the long s (ſ), which should not be used at all in Middle French entries. This is because the long s is considered a typographical variant of the Latin s, rather than as a separate letter.

Many of the diacritics Modern French use appear during the Middle French period. All attested spellings are permitted, for example durée and duree. It is advisable to use {{alternative form of||lang=frm}} wherever practical to reduce duplication.

Discretion may be used with respect to capitalization. For example MAISON as the first word of a chapter should be listed at maison, not MAISON.

The 'nasal' vowels ã, ẽ (sometimes ê) and õ are transcribed as an, en and on respectively. for example bõne is rendered as bonne.

The letters 'u' and 'v' are often both written as 'u' in Middle French texts, or both written as 'v'. This is to be interpreted as a stylistic choice rather than When pronounced /v/ it should be rendered as 'v' and not 'u'. For example trouuer should be rendered as trouver. This is because trouuer is a typographical variant of trouver rather than a different spelling of it.

http://www.books.google.fr, using the 'Recherche avancée' (advanced research) function, select from 1400 to 1599 to include only Middle French books. However, Google Books does not always have its dates right, for example it might pick up a modern version of a text originally written in the 1340-1611 period

Per WT:CFI#Attestation, dead languages may have entries based on a single mention, if this mention is from "materials deemed appropriate as the only sources for entries based on a single mention". The following are considered such source

Dictionnaire de l'ancienne langue française et de tous ses dialectes du IXe au XVe siècle (Godefroy, Frédéric). Dependent of dates given with the citations, since it does not distinguish between Old and Middle French.